Kingdom of Iran, Mohammad Reza Pahlavi, 1 Rial 1357 SH

In Arab countries rial was the original name for large European silver coins such as the taler and the peso. Later, the name was transferred to locally issued coins in such countries as Oman, Iran and Yemen, and remains the name of the local currencies in those countries to this day.
Iranian coins were dated according to the Moslem lunar calendar until March 21, 1925 (AD), when dating was switched to a new calendar based on the solar year. The new dating is indicated by the notation SH on the coins.